Ferritic-austentitic chromium-nickel steel and method of making a steel body
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United States of America Patent
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Jun 9, 1981
Grant Date -
N/A
app pub date -
Apr 10, 1979
filing date -
Apr 10, 1978
priority date (Note) -
Expired
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Abstract
Steel bodies composed of ferritic-austenitic Cr-Ni steel with 30 to 70% austenite and consisting essentially of: up to 0.1% by weight carbon, up to 1.0% by weight silicon, 4.0% to 6.0% by weight manganese, 22.0% to 28.0% by weight chromium, 3.5% to 5.5% by weight nickel, 1.0% to 3.0% by weight molybdenum, 0.35% to 0.6% by weight nitrogen, balance iron and unavoidable impurities, are subjected to forging and after even second degree deforming, possess a notch impact strength (tenacity) according to the ISO-V test of more than 35 Joule and a minimum yield point of 600 N/mm.sup.2.
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